In Buddhism there is the word "dukkha", which has a number of meanings & uses:
(1) "Dukkha vedana", which means "painful feelings".
(2) "Dukkha lakkhana", which means conditioned things are unable to permanently satisfy; or "unsatisfactoriness"
(3) "Dukkha" as "suffering"; i.e., "difficult to bear"; "hard to endure".
Every person born in the world must experience 'painful feelings' from hunger, cold, heat, sickness, brokenness of the body, old age, seeing violence & ignorance of humanity. If a person does not have wisdom when feeling painful feelings, these painful feelings will create sorrow & torment.
Every person born in the world cannot find lasting happiness from conditioned or worldly things. Even rich people become unhappy & bored and must buy new things for pleasure because the old things do not make them happy any more. If a person does not have wisdom when experiencing the unsatisfactoriness of worldly things, their cravings & dissatisfaction will increase, like the addictions of a drug addict increase, until they die from drug overdose.
Life itself can be "dukkha", that is, difficult to bear, hard to endure, because every person must find food to eat, work & take care of a problematic physical body. This "dukkha" is because of attachment to life as "me" & "mine" or selfishness. If a person has wisdom when experiencing the challenges of life, they will not view life in terms of "me" & "mine"; therefore they will not suffer. Life is "dukkha" when there is attachment to life in terms of "self".
Therefore, 'life is struggle' because the body gets hungry, hot, cold, sick & broken and ordinary pleasures do not bring lasting happiness. 'Life is like a gold coin' because there is nothing in the gold coin that can guarantee & secure happiness. 'Life is statue of problem and sorrow' because the ignorance of the mind will inevitably lead to problems & sorrow, which is why the world still has many wars, many social problems and why people still sorrow & grieve.
But the 'Holy Life' of the Buddha is not a struggle, not a (deceptive) gold coin and not a problem with sorrow. The Buddha explained Nirvana is undeceptive true happiness (MN 140). Nirvana is experienced when the mind does not have attachment to anything as "I", "me" & "mine".
His release, being founded on truth, does not fluctuate, for whatever is deceptive is false; Nirvana — the undeceptive — is true. Thus a
monk so endowed is endowed with the highest determination for truth,
for this — Nirvana, the undeceptive — is the highest noble truth.
This is peace... the calming of all formations, the relinquishing of all attachments, the ending of craving, dispassion, cessation (of